Pulse oximetry is a procedure used to measure the oxygen level (or oxygen saturation) in the blood. It is considered to be a noninvasive, painless, general indicator of oxygen delivery to the peripheral tissues (such as the finger, earlobe, or nose).ulse oximetry is a procedure used to measure the oxygen level (or oxygen saturation) in the blood. It is considered to be a noninvasive, painless, general indicator of oxygen delivery to the peripheral tissues (such as the finger, earlobe, or nose).
The area of the World Ocean is about 361.9 million square kilometers (139.7 million square miles), which covers about 70.9% of Earth's surface, and its volume is approximately 1.335 billion cubic kilometers (320.3 million cubic miles).
Quora. Dec 2016 about 71 percent of the earth's surface is water covered, and oceans hold 96. Water also exists in the air as water vapor, rivers and lakes, icecaps glaciers, ground soil moisture aquifers, even you your dog. Googleusercontent search. Over 68 percent of the fresh water on earth is found in icecaps and glaciers, just over 30 ground. The water in the world (pdf) united states environmental facts worldwide weighing earth's from space feature articles.